Eathtek Replacement Keyboard without Frame For HP ProBook 4540s 4540 series Black US Layout, Compatible with part# 639396-001 701485-001 NSK-CC3SW 01 Compatible Model Numbers: HP ProBook 4540s 4540 Compatible Part Numbers: 639396-001 701485-001 NSK-CC3SW 01 Replacement and high quality,Replace your faulty, cracked or broken keyboard Each keyboard is tested before shipping All pictures are taken from the real item, please check carefully before bidding.